Limited range stereo-audio video RF transmitter to multiple receiver system

• US 5,243,415 A
• Filed: 04/05/1991
• Issued: 09/07/1993
• Est. Priority Date: 04/05/1991
• Status: Expired due to Fees

• Current Assignee: Primo Microphones Incorporated (Primo Japan, Inc.)
• Original Assignee: Primo Microphones Incorporated (Primo Japan, Inc.)
• Inventors: Vance, R. Edward
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): BELZER, CHRISTINE
• Application Number:
  US07/680,840
• Time in Patent Office: 886 Days
• Field of Search: 455/4.1, 455/4.2, 455/6.1, 455/6.3, 455/45, 455/66, 455/69, 455/352, 455/353, 358/86, 358/144, 358/198, 358/194.1, 381/3, 381/4, 381/14, 381/79
• US Class Current: 725/81
• CPC Class Codes: H04N 5/38 Transmitter circuitry for the transmission of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 7/06 Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier H04N7/084, H04N7/087 take precedence
• CPC Class Codes: H04N 7/10 Adaptations for transmission by electrical cable H04N7/12 takes precedence

Abstract

A stereo-audio video limited range low power RF transmitter to receiver system is provided transmitting signal from a video cassette recorder (VCR), satellite converter, TV camera, cable select box and a TV receiver/monitor, or VCR, utilizing a wireless signal path retaining signal quality normally associated with conventional wiring. Two-channel stereo-audio is passed via two independent audio channels matched to selected video channels for combined short range RF transmitter to receiver transmission to one or more television sets and/or VCR sets in different rooms, with at times display and/or recording simultaneously the same transmitted program from the transmitter of the system.

Claims

1. A limited range stereo-audio video transmitter to receiver system comprising:

transmitter means including, radio frequency combined TV video and two audio channel (left and right) signal source means;

video signal amplifying means;

left audio channel amplifying means; and

right audio channel amplifying means connected to said signal source means;

mixing network circuit means circuit connected to the outputs of said video, left and right audio amplifying means;

voltage controlled oscillator (VCO) means with output line connection means;

phase lock loop circuit means connected from said VCO output line connection means back to said VCO;

said VCO output line connection means connected as an input to a second amplifier circuit;

said second amplifier circuit output connected to transmitter antenna means;

a RF receiver antenna;

receiver means including, bandpass filter means input connected to receive RF program signalling from said RF receiver antenna;

RF signal amplifier means connected to an output from said bandpass filter means;

signal mixer circuit means connected to the outputs of said RF signal amplifier means and the output of a receiver VCO, and having an output connection as the input connection to an intermediate frequency (IF) amplifier output connected as the input to an FM demodulator;

said FM demodulator having an AGC connection back to said RF signal amplifier means and an AFC connection back to said VCO;

said FM demodulator also having an output connection through a subcarrier reject filter circuit as the baseband video signal input connection to a stereo TV set;

said FM demodulator also having audio output connection to left channel audio IF amplifier means, in a left audio channel connected to the left audio channel input connection of said stereo TV set, and with said FM demodulator also having audio output connection to right channel audio IF amplifier means in a right audio channel connected to the right audio channel input connection of said stereo TV set.

2. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein the system stereo audio utilizes two independent sub-carriers with said left channel audio IF amplifier connected through a left audio channel FM demodulator, line amplifier and left channel audio output circuit connection to the left audio channel input connection of said stereo TV set;

and with said right channel audio IF amplifier connected through a right audio channel FM demodulator, line amplifier and right channel audio output circuit connection to the right audio channel input connection of said stereo TV set.

3. The limited range stereo-audio video RF transmitter to receiver system of claim 2, wherein a mixing network circuit is connected to receive the audio output signal of said left audio channel line amplifier, and to receive the audio output signal of said right audio channel line amplifier, and output connected to a channel 3/4 modulator circuit with switch;

connection of the video sub-carrier reject filter output video signal input to a stereo TV set and also to said channel 3/4 modulator circuit with switch;

an RF output combined mono TV signal output of said channel 3/4 modulator circuit with switch connectable as the RF signal input to a mono TV set.

4. The limited range stereo-audio video RF transmitter to receiver system of claim 3, wherein said sub-carrier reject filter circuit output is connected through a video amplifier as part of said baseband video signal input connection to a stereo TV set;

and with the connection of the video sub-carrier reject filter output video signal input to a stereo TV set also to said channel 3/4 modulator circuit with switch being a connection from the output of said video amplifier.

5. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said sub-carrier reject filter circuit output is connected through a video amplifier as part of said baseband video signal input connection to a stereo TV set.

6. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said radio frequency combined TV video and two audio channel (left and right) signal source means is a TV cable RF signal source.

7. The limited range stereo-audio video RF transmitter to receiver system of claim 6, wherein said TV cable RF signal source includes a cable box circuit with an RF signal output connection as said radio frequency combined TV video and two audio channel (left and right) signal source.

8. The limited range stereo-audio video RF transmitter to receiver system of claim 7, wherein said cable box circuit RF signal output connection is through a VCR player.

9. The limited range stereo-audio video RF transmitter to receiver system of claim 7, wherein said cable box circuit RF signal output connection is through a VDP player.

10. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said radio frequency combied TV and two audio channel (left and right) signal source means is a satellite antenna dish connected through a satellite converter circuit with an RF signal connection to the transmitter the system.

11. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said radio frequency combined TV video and two audio channel (left and right) signal source means is a TV signal receiving antenna.

12. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said radio frequency combined TV video and two audio channel (left and right) signal source means includes a plurality of alternate RF signal sources;

an ABC switch switchable for connecting a selected one of said plurality of alternate RF signal sources to said transmitter input.

13. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein said transmitter antenna means is a full wave length delta antenna.

14. The limited range stereo-audio video RF transmitter to receiver system of claim 13, wherein said RF receiver antenna is a loop type antenna to assist in suppressing interference noise.

15. The limited range stereo-audio video RF transmitter to receiver system of claim 1, wherein splitter circuit means is included in said second amplifier circuit connection to said transmitter antenna means;

said bandpass filter means also includes splitter circuit means;

RF control signal source means connected to said splitter circuit means of said bandpass filter means for RF signalling to said RF receiver antenna in a transmit mode and said transmitter antenna means in a receive mode;

RF signal control means in said RF transmitter connected to said splitter circuit means for receiving RF control signals received by said transmitter antenna means.

16. The limited range stereo-audio video RF transmitter to receiver system of claim 15, wherein said RF control signal source means includes an infrared controller generating infrared signals;

an infrared receiver receiving infrared control signals;

an infrared signal detector circuit; and

an RF modulator circuit connected to said infrared signal detector and output connected to said splitter circuit means with said bandpass filter means.

17. The limited range stereo-audio video RF transmitter to receiver system of claim 16, wherein said RF signal control means in said RF transmitter includes connection of said transmitter antenna means back through said splitter circuit means;

an RF demodulator circuit means input connected to said splitter circuit means and output connected to infrared transmitter circuit means for generating infrared control signals;

infrared signal control means controlling play, audio and on/off functions of the system as controlled via infrared control signalling generated by said infrared transmitter circuit means.

18. The limited range stereo-audio video RF transmitter to receiver system of claim 17, wherein said infrared signal control means is part of the VCR with the infrared signal control means also having pause, change channel, search, fast forward and still frame/frame advance functions.

19. The limited range stereo-audio video RF transmitter to receiver system of claim 17, wherein said infrared signal control means is part of a Video Disk Player.